How do I get the Strava client APIs generated?

https://developers.strava.com/docs/ specifies how to generate client code.
I got the model generated 

java -jar C:\swagger-codegen-cli.jar generate --lang java --output C:\SwaggerCodeGen\strava-models --input-spec https://developers.strava.com/swagger/swagger.json --config C:\config.json

This is 1 of the config settings I used

{
  "groupId": "com.vschouppe.strava",
  "artifactId": "strava-api-client",
  "apiPackage": "com.vschouppe.strava.api",
  "modelPackage": "com.vschouppe.strava.model",
  "invokerPackage": "com.vschouppe.strava.invoker",
  "generateApis": true,
  "generateModels": true,
  "library": "resttemplate",
  "dateLibrary": "java8",
  "serializationLibrary": "jackson",
  "hideGenerationTimestamp": true
}

Why are my clients and api’s not generated?
i.e.

https://developers.strava.com/docs/reference/ 

import com.strava.api.v3.auth.*;

import com.strava.api.v3.model.*;

import com.strava.api.v3.api.ActivitiesApi; 
 

ApiClient client = new ApiClient(...); ActivitiesApi api = client.createService(ActivitiesApi.class);